Effects of Heavy Metal Cadmium (Cd) Stress on Seed Germination and Seedling Growth of 4 Species of Forest Trees
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摘要: 为筛选适宜的乡土植物在四川境内开展镉污染土壤修复，选择4种乡土木本植物（云南松Pinus yunnanensis、桤木Alnus cremastogyne、红椿Toona ciliata、五小叶槭Acer pentaphyllum）的种子，分别设置不同浓度梯度，研究重金属Cd胁迫对植物种子萌发及幼苗生长的影响。结果表明，就发芽率而言，镉对云南松的萌发没有明显影响，对桤木种子的萌发具有抑制作用，对红椿和五小叶槭的萌发具有一定的促进作用。就幼苗生长而言，镉处理对云南松的苗长和根长均具有促进作用；对桤木和五小叶槭总体表现为促进苗长，抑制根长；对红椿表现为抑制苗长，促进根长。耐受性综合评价结果显示，这4种植物镉耐受性强弱为红椿 > 云南松 > 五小叶槭 > 桤木。Abstract: In order to select suitable local plants for remediation of cadmium contaminated soil in Sichuan, seeds of 4 kinds of native woody plants (Pinus yunnanensis, Alnus cremastogyne, Toona ciliate and Acer pentaphyllum)were cultivated in cadmium(Cd) solutions with a series of concentrations to investigate the effects of heavy metals on seed germination and seedling growth. The results showed that Cd had no obvious effect on seed germination of P. yunnanensis, but inhibited that of A. cremastogyne and increased that of T. ciliate and A. pentaphyllum. Cd promoted the root and shoot growth of P. yunnanensis during seedling growth. For other species, Cd promoted shoot growth and inhibited root growth of A. cremastogyne and A. pentaphyllum, but inhibited the shoot growth and promoted root growth of T. ciliata. Tolerance evaluation results showed that the Cd tolerance of the 4 species in descending sequence were T. ciliata, P. yunnanensis, A. pentaphyllum and A. cremastogyne.
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Key words:
- Cadmium;
- Forest trees;
- Seed germination;
- Growth;
- Stress
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